Dehydration of 1-butanol gives 2-butane as a major product, by which of the following intermediate the compound 2-butene obtained.

Dehydration of 2-butanol gives

Dehydration of 1- butanol gives 2- butene as a major product , by which of the following intermediate the compound 2- butene obtained

The dehydration of 1-butanol gives

The dehydration of butan-2-ol gives

Dehydration of Butan-2-ol produces But-2-ene as major product according to which rule ?